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Finding the Fourth Proportional to 92.12, 138.19 and 31.25

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Solution

The fourth proportional to 92.12, 138.19 and 31.25 is: 46.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.12 : 138.19 = 31.25 : x
  2. Step 2: Convert to fraction form
    92.12/138.19 = 31.25/x
  3. Step 3: Cross multiply
    92.12x = 138.19 × 31.25
  4. Step 4: Simplify right side
    92.12x = 4,317.75
  5. Step 5: Solve for x
    x = 4,317.75/92.12
  6. Step 6: Final answer
    x = 46.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.